Rotary control knob with retractable section



FIG. 1 is a top right perspective view of my rotary control knob, shown on an exemplary cooktop of a cooking appliance;

FIG. 2 is an enlarged top right perspective view of the rotary control knob of my design, with a section of the control knob shown in a retracted condition;

FIG. 3 is a top right perspective view of the rotary control knob of FIG. 2, with the section of the control knob shown in an extended condition;

FIG. 4 is a front elevational view of the rotary control knob in its retracted condition;

FIG. 5 is a top plan view of the rotary control knob of FIG. 2;

FIG. 6 is a right elevational view of the rotary control knob in the retracted condition of FIG. 2, with the left elevational view being a mirror image;

FIG. 7 is rear elevational view of the rotary control knob in a retracted condition of FIG. 2;

FIG. 8 is a bottom plan view of the rotary control knob;

FIG. 9 is a front elevational view of the rotary control knob, with a section of the control knob shown in a extended condition;

FIG. 10 is a top plan view of the rotary control knob of FIG. 3;

FIG. 11 is a right elevational view of the rotary control knob in the extended condition of FIG. 3, with the left elevational view being a mirror image; and,

FIG. 12 is a rear elevational view of the rotary control knob in the extended condition of FIG. 3.

The broken lines showing the cooktop in FIG. 1, a lower boss on the rotary control knob in each of FIGS. 4, 6, 7-9, 11 and 12, and the mounting hole in FIG. 8 are for illustrative purposes only and form no part of the claimed invention. 

The ornamental design for a rotary control knob with a retractable section, as shown and described. 